Air Filter

Replacement/Inspection Schedule

Mitsubishi recommends you periodically bring your car to your dealership to have the air filter inspected. Air filters should be replaced every 30,000 miles for the Regular Maintenance Schedule or 15,000 miles for the Severe Maintenance Schedule.* Considering the important components it protects, inspecting and replacing your air filter is cheap insurance against engine troubles.

* Review your Warranty and Maintenance Manual for complete details.


At its most basic level your car’s engine is an air pump. Fresh air is pulled in through the intake and exhaust gasses from combustion exit through the tailpipe. To keep the particles that float in the air from damaging expensive engine components, all modern engines are equipped with an air filter. Air filters remove the dirt, dust, and other impurities that might destroy an engine from the inside out and provide it with clean fresh air.

Maintaining Mileage and Performance

While the air filter does an important job by preventing damaging particles from reaching the engine, eventually those particles build up and block the flow of air into the engine. Imagine partially blocking the inlet of a hair dryer with your hand. With a smaller opening for air to flow into, the hairdryer has to work harder to pull in the same amount of air. In the same way, a clogged filter makes the engine of your Mitsubishi work harder to pull in fresh air. The harder the engine has to work, the more fuel it uses and the less power that is available to propel the car. The federal government says that checking and changing your air filter regularly can improve mileage by up to 10 percent, the equivalent of saving .23 cents per gallon.* Because the air filter clogs slowly over time, the gradual reduction in perfor- mance can be difficult to notice. That’s why regular inspection of the air filter is important.

Poor Filtration Problems

The air filter is the final barrier between the engine and harmful particles in the air. A filter that doesn’t effectively remove contaminants from the air could lead to a variety of problems. Genuine Mitsubishi air filters have a large filtering surface area that provides a long service life and highly efficient filtering under all conditions. Many non-genuine filters have a smaller filtering surface area and utilize coarser paper resulting in inferior filtering and a shorter service life. Also, the “folds” of many non-genuine filters may not be optimized for both particle trapping as well as breathability. Mitsubishi filters have folds designed specifically for your vehicle. The results of poor filtration can vary from reduced performance, a decrease in fuel economy and engine power, as well as premature cylinder and piston wear, quicker deterioration of the engine oil and potentially reduced engine life.